See, the way I see it, she signed a contract. And when I write that, that way, it sounds so harsh. But, realistically, a) it's not a threesome, rather a ménage á trois, which generally has a "2-on-1" flavor, rather than the free-for-all implied in "threesome," so I don't think she's going to be forced into doing anything with theoretical girl #2, but rather share servicing him or whatnot.